In my designs I like to use one of the coolest features of crochet: the ability to work stitches of different heights in the same row, to add shaping for instance..

But sometimes it’s not so easy to remember which is which.
I once read this super easy tip to memorize it (US crochet terms):

To make a DOUBLE crochet (dc), you have TWO loops on hook = 1 yarn over (yo) + working loop from previous st

To make a TREBLE crochet (tr), you have THREE loops on hook = 2 yarn overs (2 yo) + working loop from previous st

To make a QUADRUPLE crochet, you have FOUR loops on hook = 3 yarn overs (3 yo) + working loop from previous st

As a reminder, here’s a quick visual tutorial on how to make a TREBLE crochet: you may pause at any time by clicking on a picture

1 - Start with a double yarn over (wrap yarn twice around hook). You have a total of 3 loops on hook.

2 - insert hook in next st,

3 - yarn over and pull through 1 loop ( 4 loops on hook)

4 - yarn over

5 - Pull through 2 loops ( 3 loops remain on hook)

6 - yarn over and pull through 2 loops

7 - 2 loops now remain on hook

8 - Yarn over and pull through both remaining loops.

9 - Treble crochet is finished. Repeat from step 1 to make another Treble.

1 – Start with a double yarn over (wrap yarn twice around hook). You have a total of 3 loops on hook.
2 – insert hook in next st,
3 – yarn over and pull through 1 loop ( 4 loops on hook)
4 – yarn over
5 – Pull through 2 loops ( 3 loops remain on hook)
6 – yarn over and pull through 2 loops
7 – 2 loops now remain on hook
8 – Yarn over and pull through both remaining loops.
9 – Treble crochet is finished. Repeat from step 1 to make another Treble.

To make a QUADRUPLE crochet, it’s basically the same, except you start with a triple yarn over (wrap yarn around hook 3 times), and repeat steps 4-5 once more (number of remaining sts being different obviously).